Valve lash problem

Gurph · Mar 11, 2018

Hello, new to the forum. I appreciate any help offered.

I’ve researched but couldn’t find much on my specific issue. I have a 93 coupe, it has a TFS 1 cam, trick flow heads, and 1.6 LS rockers. This is what I was told when I purchased the vehicle. So I had the lower intake off and I decided to check the lash. I went through the recommended procedure for setting the lash.

The issue I’m having, on some of the cylinders, the rocker bolt will tighten all the way down and I still have a decent amount of lash in the rocker arm and free spinning with the push rod.....but I can’t tigheten anymore.

As stated, it doesn’t happen with all the rockers.

Thanks in advance

Gurph · Mar 11, 2018

Forgot to mention it’s pedestal mount.

Would rocker arm shims take care of this issue?

87 black gt · Mar 11, 2018

What is it doing to make you check the lash

Gurph · Mar 11, 2018

Nothing in particular. The car wasn’t running good when I bought it, I think the previous owner did a sloppy job.

I had the lower intake off, was changing the gasket. I noticed some play on the some of the rockers. That’s why I decided to go back through and check them all.

87 black gt · Mar 11, 2018

Gurph said:
Nothing in particular. The car wasn’t running good when I bought it, I think the previous owner did a sloppy job.

I had the lower intake off, was changing the gasket. I noticed some play on the some of the rockers. That’s why I decided to go back through and check them all.[/QUOTE

Gurph said:

Nothing in particular. The car wasn’t running good when I bought it, I think the previous owner did a sloppy job.

I had the lower intake off, was changing the gasket. I noticed some play on the some of the rockers. That’s why I decided to go back through and check them all.[/Q

Click to expand...

87 black gt · Mar 11, 2018

What heads are they

85ragtop · Mar 11, 2018

I'll move this to 5.0 tech.

Gurph · Mar 11, 2018

87 black gt said:
What heads are they

Canfield. And I misspoke earlier, they are 7/16 stud mount rocker arms

mikestang63 · Mar 11, 2018

there is no valve "lash" on hydraulic lifters. On these you adjust to 0 preload to zero and then usually around 1/2 t 0 1 turn to achieve the necessary ft lb of resistance which is around 18-20 I believe. You want the valve stem centered on the rocker and adjust it by either shimming the rocker or adjusting the pushrod length, depending on which way you need to move the contact patch for the rocker on the valve stem.

Are you sure you are measuring the rockers with the cam on the base of the lobe for each rocker? If you had that much slack, you would hear ticking/slapping

Gurph · Mar 11, 2018

mikestang63 said:
there is no valve "lash" on hydraulic lifters. On these you adjust to 0 preload to zero and then usually around 1/2 t 0 1 turn to achieve the necessary ft lb of resistance which is around 18-20 I believe. You want the valve stem centered on the rocker and adjust it by either shimming the rocker or adjusting the pushrod length, depending on which way you need to move the contact patch for the rocker on the valve stem.

Are you sure you are measuring the rockers with the cam on the base of the lobe for each rocker? If you had that much slack, you would hear ticking/slapping

I adjusted the intake on the compression stroke....just after the exhaust started to open. I repeated each in the firing order.

mikestang63 · Mar 11, 2018

Gurph · Mar 11, 2018

Thanks for the video. I will run those steps tomorrow and see if that works.

RichC93 · Jul 26, 2020

mikestang63 said:
there is no valve "lash" on hydraulic lifters. On these you adjust to 0 preload to zero and then usually around 1/2 t 0 1 turn to achieve the necessary ft lb of resistance which is around 18-20 I believe. You want the valve stem centered on the rocker and adjust it by either shimming the rocker or adjusting the pushrod length, depending on which way you need to move the contact patch for the rocker on the valve stem.

Are you sure you are measuring the rockers with the cam on the base of the lobe for each rocker? If you had that much slack, you would hear ticking/slapping

Question...
Does it matter if the lifter is pumped up with oil? Also if using this method does it matter if the valve is open or closed?

mikestang63 · Jul 27, 2020

nope. adjust with the valve closed and the cam on thebase of the lobe.

Valve lash problem

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